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Diagenesis and Fluid System Evolution in the Northern Oman Mountains, United Arab Emirates: Implications for Petroleum Exploration

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Diagenesis and Fluid System Evolution in the Northern Oman Mountains, United Arab Emirates: Implications for Petroleum Exploration GeoArabia, 2011, v. 16, no. 2, p. 111-148 Gulf PetroLink, Bahrain Diagenesis and fluid system evolution in the northern Oman Mountains, United Arab Emirates: Implications for petroleum exploration Liesbeth Breesch, Rudy Swennen, Ben Dewever, François Roure and Benoit Vincent ABSTRACT The diagenesis and fluid system evolution of outcrop analogues of potential sub- thrust Cretaceous carbonate reservoirs in the Musandam Peninsula, northern United Arab Emirates, is reconstructed during the successive stages of the Oman Mountains development. Detailed petrographic and geochemical analyses were carried out on fracture cements in limestones and dolomites mostly situated close to the main faults, which were the locations of major fluid fluxes. The main result of this study is a generalised paragenesis subdivided into four diagenetic time periods. Based on analyses of syn-tectonic veins and dolomites a large-scale fluid system is inferred with migration of hot brines with H2O-NaCl-CaCl2 composition along Cenozoic reverse faults. These brines were sourced from deeper formations or even from the basal decollement and infiltrated in the footwall. These results are compared with similar studies, which were carried out in other regions worldwide. Furthermore some implications for reservoir characteristics and hydrocarbon scenarios could be postulated. It must be noted that the majority of the analysed rocks do not have sufficiently high porosities to be regarded as reservoir rocks. However, some diagenetic processes that can improve the reservoir quality were observed. For example dolomite recrystallisation occurred in patches at the carbonate platform border, which created poorly connected reservoirs. Other possible exploration targets could be the footwall blocks of the Cenozoic reverse fault zones. When the migration of hot brines along these faults and into the footwall would be combined with petroleum migration, the footwall block could act as a potential hycrocarbon trap sealed by the fault. The fluid system evolution is incorporated in a schematic model of the geodynamic framework of the region in order to summarise the different diagenetic and fluid events, which took place during the northern Oman Mountains evolution up to now. INTRODUCTION Within the framework of ongoing oil and gas exploration in structurally more complex areas, the fluid systems and hydrocarbon and reservoir potential of foreland fold-and-thrust belts (FFTB’s) were investigated in numerous studies all over the world, e.g. in Pakistan (Grélaud et al., 2002; Benchilla et al., 2003), Albania (Van Geet et al., 2002; Vilasi et al., 2006; Dewever et al., 2007; Breesch et al., 2007), Venezuela (Schneider, 2003), Mexico (Ferket et al., 2003; 2004; 2006), Spain (Travé et al., 1998; 2000; 2005), Canada (Vandeginste et al., 2005; 2006; 2007; 2009) and Sicily (Dewever et al., 2006, 2010). An integrated approach, including the combination of structural geology, petrography and geochemistry as well as basin modelling, was used to determine the main controls on the reservoir characteristics in FFTB’s (Roure et al., 2005). Despite the rich offshore oil accumulations in the Arabian Gulf, the Oman Mountains still are a frontier exploration region. Two gas/condensate fields (Margham and Sajaa) are productive in the northern United Arab Emirates (UAE) in the vicinity of the thrust front (Glennie, 2005; Figure 1). A deep seismic data acquisition carried out across the foothills of the northern UAE (Ministry of Energy, UAE, 2007), however, revealed the existence of a wide underthrusting of autochthonous or para-autochthonous units. These units are derived from the former Arabian margin in the footwall of the far-travelled allochthon made up of the Hawasina Nappes and Semail Ophiolite. The main objective of this paper is the reconstruction of the diagenesis of the Jurassic – Cretaceous rocks and 111 Downloaded from http://pubs.geoscienceworld.org/geoarabia/article-pdf/16/2/111/4565957/breesch.pdf by guest on 25 September 2021 Breesch et al. a 56° 58° IRAN Semail Ophiolite Anticlinal axis Strait of Hormuz Permian-Cretaceous Thrust Musandam Thrust sheet 0 N 175 Permian-Cretaceous Gas Field 26° km 26° Platform Pre-Permian Dibba Zone Sajaa Figure 1b Margham b 56° 26° Hawasina Wadi Sha’am Window Foredeep Batinah Plai Al Jabal Wadi Ghalilah 24° Thrust Front al-Akhdar 24° Musandam n Peninsula Rams Ras Al Khaymah Wadi Bih 56° 58° Gulf of Oman 55°E 55°30’ Dibba Umm Al Qaywayn Al Khatt 25°30’N D4 25°30’ Jabal Gharaf Dadneh N Wadi Batha Mahani Dibba Zone D4 0 20 Jiri Tawi Sarram km Ajman Asimah Khawr Sharjah West-Sajaa Fakkan Sajaa Masafi DUBAI OMAN Arabian Gulf Dayd Wadi Khadra Athaba Bithnah Farfar Fujairah 25° 25° Qarn Ghanada Mulayh Khawr Oman-UAE ophiolite Kalba Qarn Nazwa OMAN 55° 55°30’ 56° Shoreface, supra/ Hamrat Duru Group Elphinstone Group Well intertidal deposit Alluvial fan and Metamorphic rocks Studied site Wadi deposit of the Dibba Zone Ophiolite rocks and mantle section Town Alluvial fan gravel Musandam and Thamama Group Low eolian dune Eolian sand dune Eolian dune ridge Ruus Al Jibal Group Figure 1: (a) Geologic map of the Oman Mountains (from Robertson and Searle, 1990). (b) Geologic map of the northern Oman Mountains outlining the location of the studied outcrop sites, the wells, the D4 regional traverse. 112 112 Downloaded from http://pubs.geoscienceworld.org/geoarabia/article-pdf/16/2/111/4565957/breesch.pdf by guest on 25 September 2021 Diagenesis and Fluid Flow, Oman Mountains the fluid system evolution during the successive stages of fold-and-thrust belt development. The study area is located in the Musandam Peninsula in the northern UAE, which constitutes an outcrop analogue of the subthrust carbonate platform duplexes imaged by recent seismic surveys (Ministry of Energy, 2007). A detailed petrographic and geochemical study was carried out on fracture cements in limestones and dolomites, mostly situated close to the main faults, which were the locations of major fluid fluxes. Apart from the importance of the fluid system reconstruction in petroleum systems, diagenetic processes can have an important influence on reservoir properties. Therefore the risk of reservoir damage remains a challenge in exploration in areas affected by diagenesis. The results of this study with respect to diagenesis, fluid flow and stable-isotope trends in the carbonate rocks of the Musandam Peninsula are compared with similar studies carried out in other regions of the world. As a summary, the fluid system evolution is incorporated in a schematic model of the geodynamic framework of the region. Based on these results and in combination with subsurface data, some implications for reservoir characteristics and hydrocarbon scenarios in the northern UAE are formulated. GEOLOGICAL SETTING Geology of the Oman Mountains The Oman Mountains in the United Arab Emirates (UAE) and Oman extend over 700 km from the Strait of Hormuz in the north to the Arabian Sea in the south. The formation of this mountain range took place during two orogenic events separated by a period of tectonic relaxation (Searle et al., 1983). After an episode of extension during the Neoproterozoic to early Cambrian, leading to the deposition of the Hormuz Salt, the study area formed part of the stable Gondwana Supercontinent during most Palaeozoic times. During the mid Permian, rifting commenced and the Neo-Tethys Ocean opened as the Iranian microcontinent migrated northwards (Baud et al., 2001, and references therein), forming a continental slope and basin at the northeastern margin of the Arabian Platform. In the Late Triassic to Early Jurassic time, the axis of ocean-floor spreading moved eastwards leading to compression of the Neo-Tethys deposits during an eastward-directed subduction in the mid Cretaceous (Glennie, 2005). The present-day Semail Ophiolite formed in the back-arc of this subduction zone. During the Campanian, the ocean started to close and the Semail Ophiolite, the Hawasina basin deposits, the Haybi volcanic complex and Sumeini slope deposits were obducted in a stacking pattern onto the autochthonous Arabian Platform. A foreland basin formed in front of the advancing thin-skinned thrust sheets of the Oman Mountains (Searle, 1988b). Slab detachment may have occurred during the Palaeogene, accounting for a slight unflexing of the foreland lithosphere. Because no continent- continent collision took place between the plates in the study area, the relief was not very pronounced with the current topography developing during a later Cenozoic orogenic event. The exact timing of the Cenozoic post-obduction tectonic phase is still debated (Warrak, 1996), but it is most likely to have taken place from Oligocene or Miocene onward. The deformation caused large- scale folding and thrusting in the northern Oman Mountains, transporting the carbonate platform deposits of the Musandam Peninsula over 15 km westwards along the Hagab Thrust (Searle, 1985; Robertson et al., 1990). Internally, the allochthonous or para-autochthonous platform succession was affected by steep reverse faulting. The present-day northern Oman Mountains consist of the carbonates of the Arabian Platform, the Dibba Zone and the Semail Ophiolite (Figure 1). The Dibba Zone is dominantly made up of the Hawasina Nappes and the underlying Sumeini slope complex exposed in a few tectonic windows. Location and Stratigraphy of the Studied Outcrops The studied outcrops have a roughly north-south distribution (Figure 1). Four of the studied outcrops are located along
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